[Q] Get Knox back after SuperSU disables it topic

I rooted my device and completely disabled the Knox app. Now, after unrooting the device, Knox is still stuck in the "Turned Off" list with no option to turn on. I need to get the app back so I can have that secure mode for work purposes. How do I turn it back on after it's been turned off. I don't mind re-rooting to get it done, but I was unable to do it while rooted, which is the main reason I did a full unroot.